Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Stephen Greetham0
Tuncay Celik0
Yu Chen0
Date of Patent
January 13, 2015
0Patent Application Number
130860840
Date Filed
April 13, 2011
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A method of controlling a brushless motor that includes rectifying an alternating voltage to provide a rectified voltage, exciting a winding of the motor with the rectified voltage and freewheeling the winding when current in the winding exceeds a threshold. The winding is freewheeled for a freewheel period, which is updated in response to a zero-crossing in the alternating voltage. Additionally, a control system that implements the method, and a motor system that incorporates the control system.
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